Cylinder paper mill



Feb. 17, 1931. U KlRCHNEl- ET AL l 1,793,230

CYLINDER PAPER MILL Filed Nov. 2, 1929 3 Sheets-Sheet l Feb. 17, 1931. U, KlRcHNER ETAL 1,793,230

CYLINDER PAPER MILL Filed Nov. 2, 1929 3 Sheets-Sheet 2 Feb. 17, 1931. u. KIRCHNER ET Al.-

C'YLINDER PAPER MILL Filed Nov. 2, 1929 3 Sheets-Sheet 3 l I um HIIIIIII HI IIIIII Patented Fel; 1'7, 193i UNITED STATES *PATENT [erstes N ULRICH' or Ynzumaacu-ort-'11Hneuss, AND eEnaL-n s rancxaa, or :Dama-A y A arm, GERMANY.

Parma Application med november 2, 1929, seriai No.

In spite of continuous experiments which have been made in the paper and pasteboard industry for more than 200 f ears for the purpose of replacing the cylin ers which are I generally-used by machines operating at a lower consumption of power, more rapidly3 .or continuously, none of these comstructions have .been ,capable of' even onl approximately re lacing the cylinders. e conical l pulp Vmill, 'which constitutes an enlarge'- ment of the foundation over the entire sur.- face of the cylinder grinding rollerhas only been capable of introduction in particular cases as it operates withtoo considerable l hardness. The bar mills which have been recently introduced in America, and also the conical or stone beatil mills are only cai ble of use in very denite closely defined elds even though they show an improvelo ment as regards consumption ofpower and continuity of the grindingJ operation. The two main reasons'why the cylinder machine in its present form requires .improvement are the necessary chargin operation required u therewith, and its relaively high consumptionv of power.` Both defects are substantial ly due to the same reason.

If the path of the paper pulp in a cylinder machine is traced as one line, and there 3 is marked thereon the distance during which the grinding 0' ration takes place, namely the ground wor ,it willbe seen that this disr tance is only a very small proportion of the whole line. 'By assin the materiali once .through the mac Ae t e ,gr

the grin g point, that is to say, the oper- 'f ation must be carried out by repeated chargg is illustration also indicates that the material, in order to return; to this grinding ppsition, must follow a long path.. The pulp, however, isa viscous mass, and 1n order to move over. this path must have a` considerable fall. Behind the grinding pomt itmust,therefore,'be pumped to a-higher level in order to be able ,tev return to the grmdi'ng position.' This explains the second. disad-y vantageof the cylinder machine, viz. its hlgh inding is not. ycompleted, but on the contrary the material must be dllassed a number of timesthrough.

404,2 52,and in Germany November -145 1988.

consumption of power. The material after each passage through the grinding pointl `must be pumped to a h' her evel through a considerable distance wich is generally leffected by the grinding roller itself. The necessary consumption of power for this purpose is already considerable and is furi ther increased by'reason of the fact that the grinding roller operates very poorly as a pump. f. 6c

` In combination with the foregoinga fundamental side of cylinder din will` v also be dealt with. The fact t at the ength L of the grinding surface is very small relatively to the total path makes it necessary for the material at'th'el grinding point to be treated comparatively energeticallly, that is to say, it must'be comminuted by s arp cuts.

For felting the material itis necessary tov comminute the material' more by squeezing 70 than by cutting. The capacit ,for felting of` .the material increases when t e Jtreatment is l carried out -very slowly and carefullyl. If attempts are made to effect this in a cy 'nder machine, by effecting the grinding carefully, then for the production of a unlt of paper material such Alon .periods of rotation and such high costs o power are incurred that Jthe process becomes uneconomical. f

. Further it is, however, also important and necessary for obtaining an eflicient action to allow the material, in ad 'tion to the suitable treatment of the grinding surfacesthemselves, to remain alone during theperiod between its passage through the grinding points, as naturally the swelling a'ctions in the libres and the formation of slime require time for their development.A J

Id order to eliminate the above mentioned 'drawbacks of the cylinder machine ih is, therefore, necessary, to improve the ratio between the length of the grinding surface and the total path ofthe pulp whilst retaining' the` change between the. assage through the grinding surfaces and t e con-` veying between the grinding points so that in the meantlme the materia is left to itself. According `to the present invention this double result is obtained in that in the interiorof the grinding roller, which in the lo@ 5'" Y known manner 1s made hollow and 1s.o en at its ends, there is provided a groun -work which only extends over a case the usualvat may be omitted.

In th accompanying drawingsl are illustrated t ree examples of construction of the new cylinder machine Figure 1 is a cross section of the first form of construction.

-Figure 2 shows the suspension of the internal ground-work.

Fizgure 3 is a section on the line 3;-3 of Figure .sa

Figures 4 and 5 show another formi of construction of the internal ground-work in side elevation and plan.

\ Figures 6 and 7 show a second form of construction of the new cylinder machine in cross section and plan.

Figures 8 and 9 show a third form of construction of the new cylinder machine in cross section andI plan.

In the form of construction according to Figures 1 to 3 the grindin roller 1, to be described hereinafter in detal ,is mounted ina usual trough 2 of the usual character having an inclined gutter 3, which in plan is of O-shape and provided 'with an enlargement 4 over which the pulp is raised towards the right so as to return through the gutter 3 to the. left of the grinding roller. The

grinding roller co-operates in the usual manner with a ground-work 5 in the bottom 'of the trough 2.

The grinding tools of the grinding roller consist of metal cutters 6 which inthe usual manner are secured in the end walls 7 of the roller. The otherwise usual wood lining between the cutters 6 is in the present case omitted so that the /pulp can enter and again pass out through the 4spaces between the cutters into and out of the interior of the grinding roller. l

The: grinding roller, rotated in any suitable manner, is -mounted at both ends in pivots 8 which vare rotatably fitted into eyes 9 of levers 10. The latter are rotatable about 4fixed pivots 11 and can be rocked on these -for",.exampleifby means of screws 12 so as to adjust the distance of the grinding roller 1( =froiiithe ground-work 5.

In the interior of vthe grinding roller is provided.; a second J lgldund-work 13 l which fltted eccentrically and non-rotatably in the supporting pivots 8 ofthe grinding roller 1 andthese pivots are provided with arms 17 with screws 18 in their ends which bear against lateral projections 19 on 'the levers 10. B turning the screws 18 the internal groun -work 13 can be raised or lowered relatively to the grinding roller 1.

The pulp passes from l the lowermost parts ofthe gutter 3Iinto the trough 2 partly between the outer side of the grinding roller 1 andthe external ground-work 5, and partly through the spaces between the cutters 6 between the inner side of the grinding roller 1 and the ,internal ground-Work 13. After it has passed both ground-works it passes partlpulp a shorter return path is provided and on the whole by reason of the return' paths of different lengths an efficient mixing of thepulp is obtained. t

In the form of construction according to Figures 6 and 7 `the portion 2 is provided with two gutters 3a, 3b which in plan have substantially the form of an 8. Into the' spaces between the cutters 6 of the grinding EDU roller l are fitted wood wedges 20 beyond which the"-cutters project inwardly and outwardly. The cutters, may, however, be replaced by grinding tools of stone-ware.

The pulp flows to the overflow ov'er the enlargement 4 through the gutter 3aof' the trough 2 to one open end of the grinding roller 1 and there passes over a step 21 intothe interior thereof. It then passesbetween the inner srface of the grinding roller 1 and the internal ground-work 13 and passes to the oppositely/disposed outlet step, at the other end ofthe grinding rgller 1 which is also open,hwhich is lower than the inlet step 2l into the second gutter 3b f the trough 2 by which itis conducted. to the outer side of the grinding roller 1 andthe external groundwork. 5. uring its passage through the grinding roller 1 in the direction of its 'loncreased as the latter, after '.once Apassing through the external gi'ound-work-mustagain during its passage pass repeatedly through grinding surfaces without it being necessary to provide additional grinding rollers in the trough.

In theform of construction accordin .to

` Figures 8 and 9 an external ground-wor is not provided. In this case the pulp again passes in the direction of the longitudinal axisthrough the grinding roller 1 as in Figures 6 and 7. /The trou h 2 is provided with two gutters 3c and 3d w ich are partly superposed and are connected together by a passa e 22. -For the urpose of overcoming the `di erence in level let there is fitted into the passage 22 a wormor the like, not shown, A'which raises the pulp etween the inlet and outfrom th'e lower gutter 3d' into the upper gutterc. y

The pulp passes repeatedly between the ground-work 13 and the inner surface of the grindin roller 1 and thus again describes spira lines.

The cylinder machine according to .Figures 8 and 9 can also be`x used without a trough as it is possible to impart tothe spiral path A.of the pulp only a very slight inclination so veying of the ulp in the direction of the that the inding operation is completed by` palslsing t e pulp once through the grinding ro er.

In the forms of construction according to F1gures (ji and 7 and 8 and `9`the lateral con'-` axis of the grin ing roller 1 can be supported in that, as shown in Figures 4 andv 5, ribs 23 are provided ontherear side of the internal ground-work' 13,- these ribs extending at an s angle to the'direction of the axis and move roller.

the pulp somewhat laterally between two succeeding passages through the grinding surfaces. When the ribs 23 are of suiiicient depth it is possible to operate without a difference in level between the inlet and outlet sides and in spite of this topass the pulp'at a constant speed through the grinding The invention is not limited to the use of cutters as grinding tools, but the grindingsurfaces of the grinding roller and/or of the ground-works may also be produced of stoneware in the manner. otherwise usual.. In this case vthe grooves andl notches usually provided in the stone-ware may be retained.

AWe claim:- v.

1. Ina cylinder paper mill for the treat- `ment of raw and semi-raw materials 5for the `production of paper, cardboard, pasteboard and the like the combination with a hollow grinding roller open at its ends, of a groundwork located in the interior of the grinding i roller a'ndcxtending onlyover a portion of the internal periphery of said grindingroller and grinding tools.v provided on the interv ,trough having a secon lower level which receives the material from nal surface of said grinding roller for co-operation with said ground-work.

2. In a cylinder paper mill according to claim 1, wherein the grindingtools are in fthe form of metal cutters or stone-ware.

3. In a c'linder 'pa r mill according to claim 1, a Is aft exten 'ng through the interior oi the grindin roller, means for raising and lowering sald shaft'relatively tosaLid grinding roller, and arms secured to said being Vpivotally shaft, the said ground-work suspended from said arms.

'4. In a. cylinder` paperA mill according to A claim 1, wherein ribs are provided on the rear side or' said ground-work, saidl ribs being inclined tothe axis of said grinding roller.

5. In alcylinder paper mill according to claim 1, having means whereby the materiall tovbe treated 1s supplied to one end of the grinding` roller and conducted away from .the'other end of said grinding roller. and returned to the first mentioned'end without passing outside'the grinding roller. '1

6. In va :cylinder paper mill according vto -clairn 1, wherein the roller is mounted 1n a ttert erein located at a high level by whic the material is conducted trough having a into one end of the grinding roller, said gutter therein at a the other end of the roller, and means for conveying the `material from the low level gutter to the high level gutter.

7. In a cylinder paper mill according to laim 1 in combination with an external ground-work and grinding tools on the outer side of said grindlngroller for co-operating with said external ground-work. l

8. Ina cylinder paper mill accordingto claim' 1 in combination with an external' ground-work, and grinding tools onthe outerA side of said grindingroller for c'o-operating with said external ground-work, a trough in which said grinding roller is mounted, said grinding roller` havingA s aces between the grinding tools,`said troug having a tter therein of which portions are at di erent levels, the material to be ground being conducted to the external and internal grinding surfaces of the grinding roller on one side thereof .from the, portion of the utter at. the `low level, and a projection' in sait? trough -@ver which thefmaterial is conducted from the les rother longitudinal side of the grinding rollr therein of which one portion is disposed at a higher level than the other, the material to be treated being conducted to the outer grinding surface of the. grinding roller along one longitudinal side thereof from the portion of the gutter at alower level, a projection in said trough over which the pulp is conducted from the other longitudinal side'of the grinding roller into the portion of the gutter which is at a higher level, is conducted from the last mentioned portion of the gutter to the internal grinding surface of the grinding roller at one end thereof and passes from the other end thereof into the portion of the gutter at a lower level so as to be again 1'0- turned to the outer` grinding surface.

10. In a cylinder paper mill according to claim l, hollow trunnions secured to opposite ends of said grinding roller, a pair of arms in which said trunnions are mounted, means for adjusting said arms, a trough in which said grinding roller is mounted, an external ground-Work in said trough for co-operation with the outer surface of said grinding roller, and a shaft eccentricallyv mounted in said trunnions, the ground-work located in the interior of the grinding roller being pivotally mounted on said shaft. f

In testimony whereof we have aixed our l* signatures. Y

` ULRICH KIRCHNER.

GERALD STRECKER. 

